Cambridge IGCSE Physics 0625 — 2011 May/June Paper 5 · Variant 2

This document consists of 9 printed pages and 3 blank pages. DC (AC/DJ) 28852/6 © UCLES 2011 [Turn over UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education * 8 4 6 5 8 8 2 1 3 0 * PHYSICS 0625/52 Paper 5 Practical Test May/June 2011 1 hour 15 minutes Candidates answer on the Question Paper Additional Materials: As listed in the Confidential Instructions READ THESE INSTRUCTIONS FIRST Write your Centre number, candidate number and name in the spaces at the top of the page. Write in dark blue or black pen. You may use a pencil for any diagrams, graphs or rough working. Do not use staples, paper clips, highlighters, glue or correction fluid. DO NOT WRITE IN ANY BARCODES. Answer all questions. At the end of the examination, fasten all your work securely together. The number of marks is given in brackets [ ] at the end of each question or part question. For Examiner’s Use 1 2 3 4 Total www.XtremePapers.com

2 0625/52/M/J/11 © UCLES 2011 For Examiner’s Use 1 In this experiment you will investigate the loading of a metre rule. Carry out the following instructions referring to Fig. 1.1. 50.0 cm mark string metre rule forcemeter clamp bench Fig. 1.1 You are provided with a metre rule that is attached at one end to the bench. The other end is supported by a forcemeter. Do not change the position of the forcemeter or move the end of the rule that is attached to the bench. You are also provided with a range of masses. (a) Without placing a mass on the rule, record in Table 1.1 the reading F on the forcemeter. (b) Place a 100 g mass on the rule at the 50.0 cm mark shown in Fig. 1.1. Record in the table the value of the mass m and the reading F on the forcemeter. (c) Repeat step (b) using masses of 200 g, 300 g, 400 g and 500 g. Table 1.1 m / g F / N 0 [3]

3 0625/52/M/J/11 © UCLES 2011 [Turn over For Examiner’s Use (d) Plot a graph of F / N (y-axis) against m / g (x-axis). [4] (e) Use the graph to find the value of F when m = 375 g. Show clearly on the graph how you obtained the result. F = … [2] (f) The forcemeter shows a reading when no mass has been added to the metre rule. Assuming that the forcemeter has no zero error, suggest a reason for the reading. suggested reason … … [1] [Total: 10]

4 0625/52/M/J/11 © UCLES 2011 For Examiner’s Use 2 In this experiment you will investigate the rate of cooling of water. Carry out the following instructions referring to Fig. 2.1. You are provided with a supply of hot water. thermometer water test-tube Fig. 2.1 (a) Measure and record room temperature θR. θR = … [1] (b) Pour hot water into the test-tube until it is about two thirds full of water. Place the thermometer in the water. (c) (i) When the thermometer reading stops rising, measure the temperature θ of the water in the test-tube and immediately start the stopclock. Record θ in Table 2.1 at time t = 0 s. (ii) Record in the table the time t and the temperature θ of the water every 30 s until you have a total of seven readings. (d) Remove the thermometer and pour away the water from the test-tube. Wrap the cotton wool round the test-tube and secure it with the elastic bands. Repeat the steps in (b) and (c). (e) Complete the time and temperature column headings in the table.

5 0625/52/M/J/11 © UCLES 2011 [Turn over For Examiner’s Use Table 2.1 t / tube without cotton wool θ / tube with cotton wool θ / 0 [5] (f) State in which experiment the cooling was more rapid. Justify your answer by reference to your readings. experiment … justification … … …[2] (g) If these experiments were to be repeated in order to check the results, it would be important to control the conditions. Suggest two conditions that should be controlled. 1. … 2. … [2] [Total: 10]

6 0625/52/M/J/11 © UCLES 2011 For Examiner’s Use 3 In this experiment you will investigate the resistance of a wire in different circuit arrangements. The circuit shown in Fig. 3.1 has been set up for you. A metre rule power source A D B C V Fig. 3.1 (a) (i) Switch on. Measure and record in Table 3.1 the current I in the circuit and the p.d. V across the section of wire AB. Switch off. (ii) Record in the table the length l of the wire AB. (iii) Calculate the resistance R of the section of wire AB using the equation R = V I . Record this value of R in the table. (iv) Complete the column headings in the table. (v) Repeat steps (i) – (iii) with the voltmeter connected across section AC of the wire. (vi) Repeat steps (i) – (iii) with the voltmeter connected across section AD of the wire. Table 3.1 voltmeter connected across l / I / V / R / AB AC AD [7]

7 0625/52/M/J/11 © UCLES 2011 [Turn over For Examiner’s Use (b) It is suggested that the resistance of the wire AB should be half the resistance of the wire AD. State whether your results support this suggestion and justify your answer with reference to your results. statement … justification … …[2] (c) It is known that changes in temperature affect the resistance of the wire. Suggest how you can limit the temperature changes when carrying out this experiment. … … [1] [Total: 10]

8 0625/52/M/J/11 © UCLES 2011 For Examiner’s Use 4 In this experiment you will investigate the refraction of light through a transparent block. Carry out the following instructions referring to Fig. 4.1. eye sheet of paper C H G F N P3 P2 P1 N' D B A E P4 30° hole Fig. 4.1 (a) Place the transparent block, largest face down, on the sheet of plain paper supplied. The block should be approximately in the middle of the paper. Draw and label the outline ABCD of the block. (b) Remove the block and draw the normal NN' to side AB so that the normal is 2.0 cm from A. Label the point F where NN' crosses AB and G where it crosses DC. (c) Draw the line EF at an angle of 30° to the normal, as shown in Fig. 4.1. . (d) Place the paper on the pin board. (e) Place two pins P1 and P2 on line EF as shown in Fig. 4.1. (f) Replace the block and observe the images of P1 and P2 through side CD of the block so that the images of P1 and P2 appear one behind the other. Place two pins P3 and P4 between your eye and the block so that P3, P4 and the images of P1 and P2, seen through the block, appear one behind the other. Mark and label the positions of P1, P2, P3 and P4. Remove the block.

9 0625/52/M/J/11 © UCLES 2011 For Examiner’s Use (g) Draw a line joining the positions of P3 and P4. Continue the line until it meets CD. Label this point H. (h) Measure and record the length a of the line GH. a = … [1] (i) Draw the line HF. (j) Measure and record the length b of the line HF. b = …[1] (k) Calculate the refractive index n of the material of the block using the equation n = b 2a . n = … [2] (l) This experiment can be carried out using a ray of light, produced by a ray box, instead of by using optical pins. A student suggests that the ray box method will be more accurate. Assuming that the experiment is carried out with care, suggest one possible cause of inaccuracy using the optical pin method and one using the ray box method. optical pin method … … ray box method … … [2] Tie your ray trace sheet into this Booklet between pages 8 and 9. [4] [Total: 10]

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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the May/June 2011 question paper for the guidance of teachers 0625 PHYSICS 0625/52 Paper 5 (Practical), maximum raw mark 40 This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Examiners were instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes must be read in conjunction with the question papers and the report on the examination. • Cambridge will not enter into discussions or correspondence in connection with these mark schemes. Cambridge is publishing the mark schemes for the May/June 2011 question papers for most IGCSE, GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses. www.XtremePapers.com

Page 2 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – May/June 2011 0625 52 © University of Cambridge International Examinations 2011 1. (a), (b), (c) Correct masses 100, 200, 300, 400, 500 [1] F column complete, all values < 10N and to at least 1d.p. [1] F values increasing [1] (d) Graph: Axes labelled [1] Scales suitable [1] All plots correct to nearest ½ small square [1] Well-judged best fit, thin line [1] (e) Correct F to ½ small square with unit N [1] Clear how obtained [1] (f) Weight/mass/force of rule owtte [1] [Total: 10] 2. (a) θR sensible value [1] (c) – (e) t in s, both θ in ºC [1] Correct t values 30, 60, 90, 120, 150, 180 [1] Uninsulated tube temperatures decreasing [1] Insulated tube temperatures decreasing [1] Slower rate of fall in insulated tube [1] (f) Statement matches readings [1] Justified by reference to temperature differences and time [1] (g) Any two from: initial temperature/starting temperature/temperature of hot water (constant) room temperature/ correct named reference to environmental condition tube size/same test-tube thickness of glass volume/amount/level of water thickness of cotton wool depth (of immersion) of thermometer (rate of) stirring [2] [Total: 10]

Page 3 Mark Scheme: Teachers’ version Syllabus Paper IGCSE – May/June 2011 0625 52 © University of Cambridge International Examinations 2011 3. (a) mm or cm or m, A, V, Ω [1] Correct lengths 50cm, 75cm, 100cm [1] I values all to at least 2 d.p. (<1A) [1] V values all to at least 1 d.p. (<3V) [1] R values correct [1] R consistently to 1 or 2 d.p. [1] RAD = 2RAB to within 10% [1] (b) Statement matches results [1] Justification refers to results and matches statement, including idea of ‘within limits of experimental accuracy’ [1] (c) One of: Switch off between readings Use of low current (owtte) [1] [Total: 10] 4. Trace: Normal correct [1] All lines present and neat [1] P3P4 distance > 5.0cm [1] EFN = 30º ± 2º [1] (h) a correct to 2mm [1] (j) b correct to 2mm [1] (k) n correct value, 2 or 3 significant figures, no unit [1] n 1.4 – 1.6 [1] Pin: pins not vertical/not straight/pins too close/thickness of lines/size of holes [1] Ray Box: thickness of ray [1] [Total: 10]